One of the strange things about being a physician is that we spend more than a decade learning how to diagnose complex diseases — but almost no time learning how to manage money or taxes.

So what happens?

We learn from the doctor’s lounge.

And just like medical folklore, some of that advice spreads quickly… even when it’s wrong.

Over the years running The Prudent Plastic Surgeon, I’ve heard the same tax myths repeated again and again by physicians — residents, attendings, and practice owners alike. Some come from colleagues. Some come from online forums. And some even come from accountants who don’t really understand physician income structures.

Unfortunately, a few of these myths can quietly cost doctors thousands of dollars each year.

Here are five of the most common ones I still hear.

Myth #1: “If I Max My 401(k), My Tax Planning Is Done”

Retirement accounts are important. But they are just one piece of the puzzle.

A lot of independent physicians assume that if they max out their retirement accounts, they’ve done all the tax planning they need.

I thought this early in my career too.

Max the 401(k). Maybe add a backdoor Roth. Call it a day.

But once physicians start earning 1099 income, the picture changes.

The bigger issue often becomes self-employment tax, which applies to independent income at 15.3% up to the Social Security wage base. Maxing a 401(k) can reduce your income tax, but it doesn’t do anything to reduce self-employment taxes.

That’s where real tax planning begins to matter.

For many independent physicians, meaningful tax planning eventually involves decisions around entity structure, income timing, strategic deductions, and retirement plan coordination. None of these strategies are particularly exotic, but they can have a large impact when income is coming from multiple sources.

Relying on a 401(k) alone is a little like trying to perform surgery with only a scalpel. It’s an essential tool — but it’s not the entire operating room.

Myth #2: “You Need an S-Corp to Take Business Deductions”

This is one of the most common misunderstandings I hear from physicians starting independent work.

Some people assume that without an S-Corporation, they can’t take business deductions.

That’s not true.

If you earn 1099 income, you can deduct legitimate business expenses as a sole proprietor using Schedule C. That includes many expenses physicians incur regularly — CME courses, malpractice insurance, licensing fees, professional memberships, medical supplies, and certain travel costs.

An S-Corporation can become useful at higher income levels because it may help manage self-employment taxes. But forming one purely to claim deductions often doesn’t make sense.

S-Corps come with additional complexity: payroll requirements, corporate filings, accounting costs, and stricter compliance rules.

For many physicians early in their independent income journey, those administrative costs outweigh the benefits.

Like most financial decisions, timing matters. The structure that makes sense when a physician earns $25,000 of side income may be very different from what makes sense when that income grows to $200,000.

Myth #3: “Physicians Make Too Much Money for Roth Accounts”

It’s true that physicians often exceed the income limits for making direct Roth IRA contributions.

But that doesn’t mean Roth savings are off the table.

Two strategies are commonly used by physicians who want to continue building tax-free retirement assets.

The first is the backdoor Roth conversion, which involves contributing to a traditional IRA and then converting the funds into a Roth account.

The second is the mega backdoor Roth, available through certain employer retirement plans that allow large after-tax contributions that can later be converted to Roth.

These strategies require careful execution and coordination with a tax professional. But when used correctly, they allow high-income physicians to continue building tax-free retirement assets.

Over a 20- or 30-year career, that tax-free growth can become extremely valuable — particularly for physicians who expect to remain in higher tax brackets throughout their careers.

Myth #4: “Tracking Business Mileage Is Too Complicated”

I’ve heard many physicians skip mileage deductions entirely because they assume the documentation will be overwhelming.

But modern mileage-tracking apps have made this surprisingly simple.

If you drive between hospitals, clinics, surgery centers, administrative offices, or CME events, those miles may qualify as deductible business travel.

For physicians who split time between multiple practice locations, the number of business miles can add up quickly. Thousands of deductible miles per year is not unusual.

The IRS allows two methods for vehicle deductions: the standard mileage rate or actual vehicle expenses. Each method has different advantages, and once you begin using a method for a vehicle, switching between them can be limited.

Many physicians miss this deduction entirely simply because they assume the process will be complicated when, in reality, tracking it can be done with an app running quietly in the background.

Myth #5: “Health Insurance Premiums Are Just Another Itemized Deduction”

For self-employed physicians, health insurance deductions work differently than many people assume.

Instead of appearing on Schedule A as an itemized deduction, they are usually taken above the line, meaning the deduction occurs before Adjusted Gross Income (AGI) is calculated.

That distinction matters.

AGI plays a role in determining eligibility for many other deductions, tax brackets, and phase-outs. Lowering AGI can influence everything from certain tax credits to Medicare premium calculations.

And importantly, physicians can often take the health insurance deduction even if they use the standard deduction.

Because of this, the tax benefit is often larger than many physicians expect.

Why Physician Taxes Are Often More Complicated

Part of the reason these myths persist is that physician income often comes from multiple sources.

A physician may have W-2 income from a hospital or group practice, 1099 income from moonlighting, consulting payments, practice ownership income, and investment income from real estate or partnerships.

Each of those income streams can have different tax treatment.

Advice that works for a typical salaried employee doesn’t always translate cleanly to physicians whose income flows through several different channels.

That complexity is why many of the myths above continue to circulate.

Taxes Don’t Start in April

Most physicians think taxes begin when the return shows up.

But by then, most of the important decisions have already been made.

Not on the tax forms — but in everyday moments during the year.

When moonlighting income goes into the wrong account.
When CME expenses aren’t tracked.
When a “small” side gig quietly becomes meaningful income.
When a new investment produces a K-1 that nobody planned for.

Tax filing records what already happened.

Tax planning shapes the year while it’s happening.

And for physicians with income coming from multiple directions — W-2 income, 1099 work, consulting, practice ownership, or real estate — those small decisions compound quickly.

The “If My CPA Asked Today” Test

Here’s a simple stress test.

If your CPA asked for everything today, would it take five minutes or five hours?

Many physicians don’t really have a tax system. They have a pile.

A pile of PDFs.
A pile of emails.
A pile of transactions they hope are deductible.

A better question to ask yourself might be this:

Could I roughly estimate my tax bill today?
Do I know exactly where every 1099 payment goes?
Am I tracking deductions now, or rebuilding them later?
Does my entity structure still match my income?

Most physician tax stress doesn’t come from complicated strategies.

It comes from small things drifting for twelve months — and then trying to fix them all at once in April.

At the end of the day, most physician tax mistakes don’t happen because doctors aren’t smart enough to understand them.

They happen because we were never taught how the system actually works.

So we rely on advice from colleagues, forums, or things we heard once in the doctor’s lounge — and some of those ideas stick around long after they should.

The goal isn’t to become a tax expert.

It’s simply to stay curious, question assumptions, and understand the basic principles that apply to physicians.

Because once you start doing that, many of these “myths” stop looking like rules — and start looking like opportunities.